Simulation - Recommended if you plan to stay within the Simulation module to continue your work (preparing and solving a simulation). Also, if you are planning to perform a Fluid-Structure Interaction problem with CFX, and desire to use a single project to manage your Workbench folders, you should use Simulation to perform your fluid meshing. This is most conveniently done in a separate model branch from the structural meshing and structural simulation.

Meshing - Recommended if you plan to use the mesh to perform physics simulations in the ANSYS CFX or ANSYS AUTODYN modules, or other physics solvers such as FlUENT. If you wish to use a mesh created in Meshing for a solver supported in Simulation, you can convert the mesh database into a Simulation database. See Converting a Meshing Session to a Simulation Session.

For ANSYS AUTODYN applications, use the Meshing module for tetrahedral, hexahedral, and surface quadrilateral/triangle meshing. Use the Explicit physics preference setting in the Details View of the Mesh folder to obtain the desired lower order elements.

Advanced Meshing - The Advanced Meshing module is a separately priced product and recommended if you require an all-hexahedron mesh, or advanced mesh and/or geometry editing features.